Pipe perforator



A. L. FONDREN PIPE PERFORATOR Jan. 25, 1927.

Filed Sept. 12, 1925 Patented Jan. 25, 1927.

P'TENT OFFICE.

ARTHUR L. sc ews, or nousron, TEXAS.

PIPE PERFORATQR.

Application filed September 12, 1925. Serial No. 55,952..

This invention relates to new and useful improvements in a pipe perforator.

One object of the invention is to provide a tool of the character described specially adapted to be inserted into a pipe or tube and by means of which said pipe may be perforated from the inside; the tool has been designed particularly for perforating pipe which has been set in a well bore.

Another object of the invention is to provide a tool, of the character described, which is of very simple construction, and may be cheaply and easily produced, and which is very effective in operation.

With the above and other ob ects in view this invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specificatlon and illustrated in the accompanying drawings, wherein Figure 1 shows a verticalsectional view of the perforator, in the pipe to be perforated, and

Figure 2 shows a side elevation thereof.

Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 1 designates the pipe to be perforated. This pipe, when set in a well bore, usually has a screen (not shown) attached thereto, but sometimes the screen, when set, is not opposite the oil bearing stratum, and in such case it becomes necessary to perforate the blank pipe opposite such stratum to permit the inflow of the oil.

The numeral 2 designates the tubular bod of the tool into the upper end of whic a coupling 3 is threaded. The upper end of this coupling may be internally threaded to provide for the attachment of an operat ing string of pipe as 4:, thereto. Threaded into the lower end of the body there is a coupling 5 and a guide, as 6, may be attached to this coupling 5, if desired to guide the tool into the pipe '1.

Within the body 2 there is a slidable anchor 7 one side of which has an outwardly flared slot 8, the bottom 8 of which is arcuate, or concaved, forming a bearing for the inner end of the punch 9 which is pivotally mounted in said slot and whose outer end works through a slot 10 out lengthwise through said body and alined with the slot 8.

Qoil springs 11, 11, are interposed between the anchor 7 and the respective couplings 3 and 5. I

Light coil springs 12, 12, are attached, attheir outer ends to the anchor 7 and at their other ends to the opposite edges of the punch 9 and normally holding the punch in right angular relation with the longitudinal axis of the perforator. One or the other of these sprin s is always under tension, operating to hold the point of the punch against the inner side of the pipe to be perforated, as shown in Figure 1.

The tool, in operation is alternately forced downwardly and pulled upwardly in the pipe to be perforated, being thus operated by the string 4-. The point of the punch 9 will be driven through the pipe 1 with each of said operations. The anchor 7 is yieldably mounted, as explained, and as the tool is operated in one direction said an chor will yield somewhat in the opposite direction, compressing the corresponding spring 10 and the punch will thus be forced gradually rather than abruptly, through the pipe, thus lessening the liability of breaking the punch or bursting the pipe.

The tool maybe moved up or down and turned around, in the pipe, until the desired 1 section of pipe is perforated all the way around. The tool has suitable water courses 13, 13, for the admission of water to wash out the pipe if necessary.

What I claim is:

1. A pipe perforator including a body having a slot in one side thereof, an anchor slidable therein having an outwardly flared slot which coincides with the first mentioned slot, a punch seated in said slot of said anchor pivoted to the anchor and bearing thereagainst, and having a point which projects through said slot in said body.

2. A pipe perforator including a tubular body having a lengthwise slot, an anchor slidably mounted in said body and having an outwardly flared slotwhich registers with the first mentioned slot, yieldable members between which said anchor is mounted, a punch, one end of which is seated in said anchor slot and bears against the anchor and is pivoted thereto, said punch projecting through said slots, and springs on opposite sides of the punch, each at tached to a fixed anchor, at one end and also attached to said punch at their other ends.

A pipe perforator including a tubular body having a lengthwise slotin its Wall, an anchor slidably mounted in said body, yieldable members between which the anchor is mounted, said anchor having a slot which registers with the first mentioned slot, a punch, one end of Which is seated in the anchor slot and bears against and is pivoted to said anchor and projects through said slots, yieldable means connected to the punch and normally tending to hold it in substantially right angular re lation to the longitudinal axis of the tool.

4. A pipe pertorator including a body having a slot therein, an anchor slidably mounted in said body and having a hearing therein, a punch pivotally mounted in said bearing and having a point which pro-1 jects through said slot and beyond said body, and pull springs, one on each side of the punch, each attached, at one end, to the anchor and at their other ends to the punch.

In testimony whereof I have signed my name to this specification.

ARTHUR L. FONDREN 

